Sirex carinthiacus

Taxonomy

Family: Siricidae
Subfamily: Siricinae
Genus: Sirex Linnaeus, 1760
Species: Sirex carinthiacus Konow, 1892
Common names: none

Background

Sirex carinthiacus is a rare, completely dark species that is known only from central Europe (Smith 1978).

Diagnostic characteristics

See Sirex for genus-level diagnostic characteristics.

The existing description of Sirex carinthiacus is somewhat incomplete; a very small number of specimens have been collected, and all are females (Borowski et al. 2019).

Females:

May be confused with

Sirex carinthiacus can be distinguished from all other Sirex in its known range (S. juvencus, S. torvus, S. noctilio) by the completely black legs. Specimens occuring outside of the known range may be difficult to separate from other dark forms of Sirex (Borowski et al. 2019).

Morphological and geographical variation

none recorded

Host associations

Sirex species feed on trees of Pinaceae and Cupressaceae. Sirex carinthiacus is known only from Picea spp. (spruce) (Borowski et al. 2019).

Life history

Female Sirex harbor symbiotic basidiomycete fungus in abdominal glands called mycangia. During oviposition, the site is inoculated with the fungus (Amylostereum spp.), which begins to decompose the surrounding wood. Larvae feed on the fungus, and in the process bore galleries through the wood (Schiff et al. 2012).

Larvae are creamy white and grub-like in appearance with a dark head capsule. As with adults, larvae possess a short dorsal horn on the posterior end of the body. The larvae bore galleries into wood, feeding until pupation and subsequent emergence. Throughout this process, the larvae use their horn to pack the tunnel behind them with sawdust. Emergence holes are perfectly circular. The fungal symbiont is carried in specialized organs in female larvae that develop into the mycangia after metamorphosis (Schiff et al. 2012).

The documented flight period of S. carinthiacus is July to September (Borowski et al. 2019).

Distribution

World: Sirex carinthiacus is found in Austria, Czech Republic, Slovakia, and Poland (Smith 1978, Borowski et al. 2019).

North America: not recorded

Map data from: GBIF.org (26 June 2019) GBIF Occurrence Download Sirex carinthiacus

Details about data used for maps can be found here.

Specimens of this species not available for imaging.